Compare the amber lenses. The more transparent lens on the right was available as a separate part number(26521-09700). The less transparent one on the left we have only seen available on new 2 wire taillights intended for European and Japanese Datsun Roadsters(26520-10400). We have never located a part number for these and as far as we know they have never been offered as a separate part number. Cool looking at night, fogged variant.